Re: 67-72 Electric speedo
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Re: 67-72 Electric speedo
The speedo out put from the PCM will be pin 50, a dark green with white stripe in the C2 connector, which is either the red or green one depending on what year your engine is.
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Re: 67-72 Electric speedo
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Re: 67-72 Electric speedo
So I guess I don't have this down yet. I got the speedo hooked up to the ecm but I'm not sure of the ignition source. I have a wire from the truck labeled gauges B+, which leads me to believe that's hot all the time? I don't want power to the gauges all the time do I? The other wire I have is the one labeled ammeter to ign sw, which I'm guessing is ignition switch. Do I need 2 ignition sources? One for the speedo one for the other gauges?
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I just took a test light to those wires. Gauges b+ is hot key on, ammeter to ignition switch is constant hot and I have a wire labeled ammeter to fuse block which is constant hot. I'm lost...
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Re: 67-72 Electric speedo
I studied your picture, I think I have this figured out. I see you have all the ignition wires coming off the fuel gauge and I'm thinking the wire i need is the gauges b+ since it's only hot keyed on.
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Yes, you only need one key on hot wire to go to all the gauges. Are you trying to hook up the factory ammeter?
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Re: 67-72 Electric speedo
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Re: 67-72 Electric speedo
I plugged in my gauges the other day and as soon as I turned the key the the fuse blew. My dash lights and turn signals are working so I assume my grounds are good. I hooked up each gauge one by one and when I got to the volt gauge I swapped from the square body the fuse blew again. Do I have a bad gauge or is it something else? Thanks in advance for any help.
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Can you post a pic of how you have it wired? My guess is it isnt wired quite right.
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Re: 67-72 Electric speedo
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Re: 67-72 Electric speedo
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Here it is
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Re: 67-72 Electric speedo
Well, I cant really tell from the pic, but I would make sure the voltmeter isnt grounding out on the tin.
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Re: 67-72 Electric speedo
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Yes, make sure the mounting bolts are not touching the tin. There are little plastic parts that insulate them, make sure they are there.
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Re: 67-72 Electric speedo
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So that was the issue, fixed that but none of the gauges work. Lights are still good, except ses light. I'm ready to throw in the towel....
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Re: 67-72 Electric speedo
Did you fix the fuse that blew? If you have power to the gauges I would think that at least one would work, highly unlikely that they are all bad.
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Re: 67-72 Electric speedo
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Re: 67-72 Electric speedo
ls1nova71 pm sent!
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Re: 67-72 Electric speedo
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Finally got this speedo completed! After reading through this thread about 100 times no exaggeration, and asking tons questions I have it completed! A couple things I did a little different was powder coating the tins since I have the equipment and cutting a hole for the tach and clock and welding a trim ring to keep the factory look.
I haven’t put the ls engine in my truck yet and I’m going to wait until the engine is in to install the new cluster. To check my work before installing, I unplugged the factory plug from the cluster that is in the truck now and used alligator clips to connect from various pins in the factory plug to the lights and gauges in the new cluster. The only thing that I haven’t tried is the speedo which is most important. So super excited to try it out. Thanks to Eric and Tom for answering all of my novice questions! I was disappointed in my painting skills, a couple of the numbers didn’t turn out the best, I should have took the decal off sooner. This project defiantly tested my patience! |
Re: 67-72 Electric speedo
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Another helpful thing I found was this diagram of the color of wires in the factory plug. Also a pic of the cluster light up with LED bulbs
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Re: 67-72 Electric speedo
Just checking in if anyone has this swap working with a Gen IV engine? I've got an 09 4.8 going into my 72 C20 and was contemplating this gauge swap, but saw that it might not work. Thanks from social distancing in Toronto.
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Re: 67-72 Electric speedo
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Re: 67-72 Electric speedo
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